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Reduce max hash in raw strings from u16 to u8

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This commit is contained in:
Grisha Vartanyan 2022-03-23 22:13:55 +01:00
parent 547369d3d8
commit 38e0ae590c
2 changed files with 11 additions and 11 deletions
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14
compiler/rustc_lexer/src/lib.rs
View File

@ -161,15 +161,15 @@ pub enum LiteralKind {
/// "b"abc"", "b"abc"
ByteStr { terminated: bool },
/// "r"abc"", "r#"abc"#", "r####"ab"###"c"####", "r#"a"
RawStr { n_hashes: u16, err: Option<RawStrError> },
RawStr { n_hashes: u8, err: Option<RawStrError> },
/// "br"abc"", "br#"abc"#", "br####"ab"###"c"####", "br#"a"
RawByteStr { n_hashes: u16, err: Option<RawStrError> },
RawByteStr { n_hashes: u8, err: Option<RawStrError> },
}
/// Error produced validating a raw string. Represents cases like:
/// - `r##~"abcde"##`: `InvalidStarter`
/// - `r###"abcde"##`: `NoTerminator { expected: 3, found: 2, possible_terminator_offset: Some(11)`
/// - Too many `#`s (>65535): `TooManyDelimiters`
/// - Too many `#`s (>255): `TooManyDelimiters`
// perf note: It doesn't matter that this makes `Token` 36 bytes bigger. See #77629
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub enum RawStrError {
@ -178,7 +178,7 @@ pub enum RawStrError {
/// The string was never terminated. `possible_terminator_offset` is the number of characters after `r` or `br` where they
/// may have intended to terminate it.
NoTerminator { expected: usize, found: usize, possible_terminator_offset: Option<usize> },
/// More than 65535 `#`s exist.
/// More than 255 `#`s exist.
TooManyDelimiters { found: usize },
}
@ -698,12 +698,12 @@ impl Cursor<'_> {
}
/// Eats the double-quoted string and returns `n_hashes` and an error if encountered.
fn raw_double_quoted_string(&mut self, prefix_len: usize) -> (u16, Option<RawStrError>) {
fn raw_double_quoted_string(&mut self, prefix_len: usize) -> (u8, Option<RawStrError>) {
// Wrap the actual function to handle the error with too many hashes.
// This way, it eats the whole raw string.
let (n_hashes, err) = self.raw_string_unvalidated(prefix_len);
// Only up to 65535 `#`s are allowed in raw strings
match u16::try_from(n_hashes) {
// Only up to 255 `#`s are allowed in raw strings
match u8::try_from(n_hashes) {
Ok(num) => (num, err),
// We lie about the number of hashes here :P
Err(_) => (0, Some(RawStrError::TooManyDelimiters { found: n_hashes })),

8
compiler/rustc_lexer/src/tests.rs
View File

@ -2,7 +2,7 @@ use super::*;
use expect_test::{expect, Expect};
fn check_raw_str(s: &str, expected_hashes: u16, expected_err: Option<RawStrError>) {
fn check_raw_str(s: &str, expected_hashes: u8, expected_err: Option<RawStrError>) {
let s = &format!("r{}", s);
let mut cursor = Cursor::new(s);
cursor.bump();
@ -68,13 +68,13 @@ fn test_unterminated_no_pound() {
#[test]
fn test_too_many_hashes() {
let max_count = u16::MAX;
let max_count = u8::MAX;
let mut hashes: String = "#".repeat(max_count.into());
// Valid number of hashes (65535 = 2^16 - 1), but invalid string.
// Valid number of hashes (255 = 2^8 - 1 = u8::MAX), but invalid string.
check_raw_str(&hashes, max_count, Some(RawStrError::InvalidStarter { bad_char: '\u{0}' }));
// One more hash sign (65536 = 2^16) becomes too many.
// One more hash sign (256 = 2^8) becomes too many.
hashes.push('#');
check_raw_str(
&hashes,